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Beautiful Mind: Sam Devlin�s Quest to Design the Perfect Boat - PassageMaker

Discussion in ' Materials ' started by ken. HJul 19, Log in or Sign up. Boat Design Net. I have been doing research on stitch and glue building and design, Devlin's and The new instant boat, devlin stitch and glue boat building review the www The stitch and glue plans I am looking at use 0. Some of the plans I have devlin stitch and glue boat building review at are for aluminium construction. From reading Aluminium has great strength but needs lots of bracing to prevent flexing.

I have read that 0. Worth, Tx, USA. Hope my calculation is correct. Its not really easy to pick a conversion on an actual design, because the stiffness of each is also vastly different. The material stiffness of aluminum is much higher than ply, but the thickness for equal weight is much much thinner, so the aluminum can be more flexible in actual practice depends upon the geometry of the design and extra stiffeners.

You would be better off asking the designer about what he would specify for a conversion - really - just get a design made for what you want to use. There are too many details of the design that need to be changed. It came out great looking but We talked about making something similar in plywood. I personally thought that was over built, but he is happy.

If you hit something or get hit, its the inside of the Devlin Stitch And Glue Boat Building Game ply that breaks. I'll try to find it. The aluminum is stiffer per thickness, but the wood is stiffer per weight. That difference is difficult for me to understand.

Any clarification or demonstration, please? A great error, often repeated here and other places, is that a layer of woven glass cloth increases stiffness in a panel. It ain't so but most believe it. Simple experiments will prove that but many will still not be convinced. Its true that glass fiber has higher tensile resistance than wood fiber but the fibers in woven cloth are not arranged to take advantage of this factor. FG fibers run over and under warp and woof and are not straight.

That means that they must be somewhat straightened out before resisting tension. Until that devlin stitch and glue boat building review, tension is resisted mainly by the resin matrix. Non woven cloth like biaxial have fibers that are straight from the get go and do greatly add to stiffness of a panel. Stiffness of a panel devlin stitch and glue boat building review beam varies by the cube of the thickness.

This should tell you where to put your money to increase stiffness and it is not on woven glass cloth. I'm not sure what the OP's goals actually devlin stitch and glue boat building review, but playing around with conversions and scantlings requires some devlin stitch and glue boat building review understanding. I perform scantling conversions with some regularity, but arbitrarily making adjustments, just don't make much sense.

As Tom rightly points out, a layer or two of cloth devlin stitch and glue boat building review doesn't do much to strength and stiffness. Substituting unidi, biax or triax can improve this to a degree, but as pointed out it's fabric weight that's the real Devlin Stitch And Glue Boat Building Code factor to consider, so by the time you have enough fabric to make a significant difference, you've added a notable amount of weight, which may be best applied elsewhere in the scantlings.

A better understanding of what the goals of this exercise is necessary, before any real advise can be offered. PARJul 20, HJul 20, The plans show fiberglass. Epoxy will work best Is there any reason to change the design? The Bingo is a typical devlin stitch and glue boat building review scooter, built with light plywood, taped seams and a few athwart stiffeners. Additional cloth on the exterior will not help if you hit a hefty branch or something at speed, you're going to be holed regardless.

A layer of kevlar on the inside Devlin Stitch And Glue Boat Building 7th of the hull, maybe in the contact patch and forward sections, where the likely locations of an impact might occur, will offer some protection, but attempting to protect for every possible contingency is impossible. Will you run over stuff, yep, you can bet on it. Will you hole the boat, maybe, it depends on how hard you like to bash into stuff, but most things will deflect away, assuming you don't see it underway and steer to clear it.

A light 'glass sheathing will offer good abrasion protection, which all most folks need. Some boats typically not a puddle scooter need more protection, like those that are dragged up on beaches, over rocks, oyster beds. These additional layers of abrasion protection will add weight and costs, detracting from performance. If you are moving at displacement speeds in the backwater areas, to avoid smashing into logs and the like, very little real damage will occur. Yes, some dings and divots could be expected, but these are repairs that you'll perform seasonally.

PARJul 21, HJul 21, Using commonly available materials, it would be hard to get more puncture resistance than with Kevlar on the inside, no matter how thick the plywood within reason. Puncture resistance is greatly increased with any common sheathing material on the inside.

If you hit floating stuff, the common result is a glancing blow that caused no real damage. Most of us have had that experience if we have been on the water very long. If you hit a rock, shame on you.

Worse floating object is a deadhead that is pointed at your boat. SukiSoloJul 21, Ken, what are you trying to do? Significantly altering Devlin Stitch And Glue Boat Building No the scantlings on one of these puddle scooters, will really hurt it's capacity and performance potential. These boats are lightly built, so they can get up and scoot.

You might be able to build a bulletproof hull, but burdened up, she'll just plow along like a scow, without tripling the HP. Hundreds of these have been built and sure a few probably smashed into something hard enough to sink it, they're easy enough to raise in fairly shallow water. Most of us cut our teeth on these as kids and I can assure you, we weren't gentle on them, but they survived, so did we. You must log in or sign up to reply.

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Books by Samual Devlin. More Photos. Jordan Skole rated it really liked it Jul 22, Open Preview See a Problem? Sam describes the exact moment when his interest in boats solidified. Ben Miller rated it it was amazing Apr 29,
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